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Choose the correct words to fill in the blank.

To enforce discipline, the principal asked the teachers to _______ the strict vigilance to deter the habitual latecomers.

Solution

✅ Correct Option: 3

'Keep up' means to maintain or continue something at the same level, so 'keep up the strict vigilance' means maintain it. 'Keep in' means confine, 'keep on' means continue doing an action (followed by a gerund), and 'keep off' means stay away from.

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